US5460507A - Injection unit for use in an injection molding machine - Google Patents

Injection unit for use in an injection molding machine Download PDF

Info

Publication number
US5460507A
US5460507A US08/150,044 US15004493A US5460507A US 5460507 A US5460507 A US 5460507A US 15004493 A US15004493 A US 15004493A US 5460507 A US5460507 A US 5460507A
Authority
US
United States
Prior art keywords
plate body
nose member
heating cylinder
hole
injection unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/150,044
Other languages
English (en)
Inventor
Satoshi Takatsugi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Assigned to FANUC LT reassignment FANUC LT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKATSUGI, SATOSHI
Application granted granted Critical
Publication of US5460507A publication Critical patent/US5460507A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/72—Heating or cooling
    • B29C45/74—Heating or cooling of the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details

Definitions

  • the present invention relates to an improvement of an injection unit in an injection molding machine.
  • an injection unit in an injection molding machine includes a front plate 1, a moving plate 2 and a rear plate 3, in this order from the front, opposite to a clamping unit (not shown), as illustrated in FIG. 2.
  • the front plate 1 includes a nose member 5 projecting from a plate body 4 toward the front.
  • a hopper 6 and a heating cylinder 7 are attached to the nose member 5.
  • reference numeral 10 denotes a tie bar linking the front plate 1 to the rear plate 3.
  • the moving plate 2 in which the screw 8 is attached to its front is slidably fitted to the tie bar 10 in the front and rear direction.
  • a ball screw 11 is pivotally attached to the rear plate 3, and its front portion is screwed into a ball nut 12 which is fixed to the rear side of the moving plate 2.
  • the inner wall portion may be provided with corrosion-resistant plating or a lining with a thin stainless tube fit into the hole.
  • the resin is melted with the rotational operation of the screw 8 in the heating cylinder 7, which is kept heated at a high temperature with a heater.
  • the nose member 5 of the front plate 1 is cooled lest a bridge is formed in the resin guiding hole due to the heated resin supplied from the hopper 6, or preheating is required depending on the characteristic of resin. For this reason, it is necessary to suitably control the temperature of the nose member so that a predetermined temperature can be maintained.
  • the nose member 5 is apt to be thermally influenced by the plate body 4, and so it has been difficult to control its temperature at a constant level either in cooling or heating.
  • the conventional heating cylinder has been directly and closely attached to the nose member 5, and so it is apt to be affected by the temperature of the heating cylinder 7.
  • An object of the present invention is to provide an injection unit having a structure designed for easier machining of the nose member of the front plate, as well as reducing the thermal influence of the heating cylinder and the plate body on the nose member.
  • the present invention provides an injection unit in an injection molding machine, comprising a front plate which joins a plate body to a nose member which is a component separated from the plate body.
  • the plate body has a through hole in the middle thereof for allowing a base of a heating cylinder to be inserted to be linked to a rear plate through a tie bar.
  • the nose member has a through hole for inserting the base of the heating cylinder in the middle thereof, and a resin guiding hole which penetrates into the through hole from outside.
  • the aforesaid injection unit is constructed so that air gaps are formed between the nose member and each of the faces of other components, which are opposite to each other in combining components such as the nose member, plate body and heating cylinder.
  • the aforesaid injection unit is constructed so that an air gap having a predetermined width and depth is formed between an inner surface of the through hole of the nose member and an outer surface of the heating cylinder.
  • a passage through which temperature controlled fluid flows is formed in the nose member which is one of components constituting the front plate.
  • an air gap having a predetermined width and depth is formed between plane of the plate body and each of the planes of the nose member combined with the plate body, which are opposite to each other.
  • an air gap having a predetermined width and depth is formed between the inner surface of the through hole of the plate body and the outer surface of the heating cylinder inserted into the through hole.
  • an air gap having a predetermined width and depth is formed between plane of a flange connected to the heating cylinder and the planes of nose member installed in the plate body, which are opposite to each other.
  • the nose member of the front plate constituting an injection unit is formed as a component separated from the plate body for easier machining and handling of the nose member.
  • FIG. 1 is a cross sectional view illustrating a portion of a front plate according to the present invention.
  • FIG. 2 is a cross sectional view illustrating part of the conventional injection unit.
  • FIG. 1 shows portions of a front plate 1 and a heating cylinder 7 which constitute an injection unit in an injection molding machine.
  • the front plate 1 comprises a plate body 4 and a nose member 5, which are separate components, as described later.
  • a heating cylinder 7 is attached to the front plate 1, in which the plate body 4 and the nose member 5 are combined.
  • the plate body 4 has a through hole 15 for allowing a base of the heating cylinder 7 in the middle of the plate body to pass therethough, and is joined to a rear plate (not shown) through a tie bar 10.
  • a reference numeral 16 denotes a cover.
  • the nose member 5 has a through hole 17 for allowing the base of the heating cylinder 7 in the middle thereof to pass therethrough, as well as a resin guiding hole 9 penetrating from the outside into the through hole 17 in the radial direction. Further, a passage 19, through which a temperature-controlled fluid flows, is formed in the interior of the nose member 5.
  • the base of the heating cylinder 7 passes through the through hole 17 of the nose member 5, and is then fitted into the through hole 15 formed in the plate body 4.
  • An injection screw 8 is inserted into the interior of the heating cylinder 7.
  • An annular locating ring 20 for centering is screwed on the concave member which is formed in the periphery of the through hole 17 on the back of the nose member 5. Further, the locating ring 20, which is screwed on the nose member 5, is fitted into an annular locating groove 21 which is formed on the periphery of the through hole 15 on the front side of the plate body 4. On this condition, a bolt 22, which has the length ranging from the front side of the nose member 5 to the plate body 4, is screwed into the plate body 4, thereby causing nose member 5 to be fixed to the plate body 4.
  • the back side of the nose member 5 and the front side of the plate body 4 directly face each other except portions of the locating ring 20 and the locating groove 21; however, an air gap 23 is formed between planes facing each other or between the back side of the nose member 5 and the front side of the plate body 4, as shown in FIG. 1.
  • a groove having a predetermined width and depth may be formed only on the side of plate body 4 or only on the side of nose member 5, or on both sides.
  • an air gap 24 having a predetermined width and depth is formed between the front side of the locating ring fixed on the nose member 5 and the bottom of the locating groove of the plate body 4.
  • a flange 26 is fixed on the heating cylinder 7.
  • the base of the heating cylinder 7, on which the flange 26 is fixed is inserted through the through hole 15 of the plate body and the through hole 17 of the nose member 5, thereby causing the back side of the flange 26 to be abutted against the front side of the nose member 5.
  • a bolt 27 is inserted into the plate body 4 from the front side of the flange 26 through the nose member 5.
  • a female screw thread for receiving the bolt 27 is previously formed in the plate body 4.
  • the flange 26 abuts the heating cylinder at a surface 25.
  • an air gap 28 is formed between the back side of the flange 26 and the front side of the nose member 5.
  • the air gap 28 is formed by providing a groove of predetermined width and depth in the front side of the nose member 5.
  • Air gaps 29 are also formed not only between the inner periphery of the through hole 17 of the nose member 5 and the outer periphery of the heating cylinder 7 opposite to the nose member, but also between the inner periphery of the through hole 15 of the plate body 4 and the outer periphery of the heating cylinder 7 opposite to the plate body. These air gaps 29 are defined by forming grooves of a predetermined width and depth, in the through hole 15 of the plate body and the through hole 17 of the nose member 5, in an example illustrated in FIG. 1.
  • the injection unit is constructed as described above.
  • the resin guiding hole 9 formed in the nose member 5 undergoes a predetermined machining before the nose member 5 is fixed on the plate body 4.
  • Various machining operations of whatever necessary such as grinding, plating or lining are executed.
  • the nose member 5 can be detached from the plate body 4 for undergoing necessary machining, and reinstalled in the plate body 4.
  • the heating cylinder 7 is heated, and the temperature controlled fluid circulates through the passage 19 of the nose member 5.
  • the air gaps 23, 24, 28 and 29 are formed between the plate body 4 and the nose member 5, between the flange 26 fixed on tile heating cylinder 7 and the nose member 5, between the heating cylinder 7 and the plate body 4, and between the heating cylinder 7 and nose member 5, respectively, so that only small thermal conductance occurs among these components.
US08/150,044 1992-03-24 1993-02-23 Injection unit for use in an injection molding machine Expired - Lifetime US5460507A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP495978 1992-03-24
JP4095978A JP2627846B2 (ja) 1992-03-24 1992-03-24 射出ユニット
PCT/JP1993/000221 WO1993018905A1 (en) 1992-03-24 1993-02-23 Injection unit

Publications (1)

Publication Number Publication Date
US5460507A true US5460507A (en) 1995-10-24

Family

ID=14152260

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/150,044 Expired - Lifetime US5460507A (en) 1992-03-24 1993-02-23 Injection unit for use in an injection molding machine

Country Status (5)

Country Link
US (1) US5460507A (de)
EP (1) EP0586706A4 (de)
JP (1) JP2627846B2 (de)
KR (1) KR970008207B1 (de)
WO (1) WO1993018905A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070026096A1 (en) * 2005-07-29 2007-02-01 Fanuc Ltd Injection molding machine
US11267177B2 (en) * 2018-11-21 2022-03-08 The Japan Steel Works. Ltd. Injection device
US11318651B2 (en) * 2018-12-27 2022-05-03 Fanuc Corporation Heated cylinder for resin melting in molding machine
US11607831B2 (en) * 2018-08-29 2023-03-21 Nissei Plastic Industrial Co., Ltd. Injection device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2582476Y2 (ja) * 1993-09-08 1998-10-08 住友重機械プラスチックマシナリー株式会社 射出成形機
CN103587034A (zh) * 2012-08-16 2014-02-19 苏州立注机械有限公司 一种注塑机料筒固定板
JP6385855B2 (ja) * 2015-02-26 2018-09-05 住友重機械工業株式会社 射出装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697204A (en) * 1970-05-07 1972-10-10 Usm Corp Apparatus for injection molding articles of foam material
GB1599276A (en) * 1976-10-19 1981-09-30 Cameron Price Ltd Injection apparatus for plastics moulding machines
GB2167339A (en) * 1984-10-17 1986-05-29 Shigeru Tsutsumi Small-sized and precision injection molding apparatus
JPS6337229A (ja) * 1986-07-31 1988-02-17 Nippon Kokan Kk <Nkk> 漏洩油検出方法
JPH0199825A (ja) * 1987-10-14 1989-04-18 Fanuc Ltd 投入樹脂の予熱を行う射出成形機
JPH0255116A (ja) * 1988-08-18 1990-02-23 Nissei Plastics Ind Co 射出成形機の射出装置
JPH03104616A (ja) * 1989-09-19 1991-05-01 Asahi Chem Ind Co Ltd 射出成形機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59192322U (ja) * 1983-06-06 1984-12-20 日精樹脂工業株式会社 射出装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697204A (en) * 1970-05-07 1972-10-10 Usm Corp Apparatus for injection molding articles of foam material
GB1599276A (en) * 1976-10-19 1981-09-30 Cameron Price Ltd Injection apparatus for plastics moulding machines
GB2167339A (en) * 1984-10-17 1986-05-29 Shigeru Tsutsumi Small-sized and precision injection molding apparatus
JPS6337229A (ja) * 1986-07-31 1988-02-17 Nippon Kokan Kk <Nkk> 漏洩油検出方法
JPH0199825A (ja) * 1987-10-14 1989-04-18 Fanuc Ltd 投入樹脂の予熱を行う射出成形機
JPH0255116A (ja) * 1988-08-18 1990-02-23 Nissei Plastics Ind Co 射出成形機の射出装置
JPH03104616A (ja) * 1989-09-19 1991-05-01 Asahi Chem Ind Co Ltd 射出成形機

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 13, No. 311 (M 851) (3659) 17 Jul. 1989 & JP A 01 099 825 (Fanuc Ltd.) 18 Apr. 1989. *
Patent Abstracts of Japan, vol. 13, No. 311 (M-851) (3659) 17 Jul. 1989 & JP-A-01 099 825 (Fanuc Ltd.) 18 Apr. 1989.
Patent Abstracts of Japan, vol. 14, No. 224 (M 972) (4167) 11 May 1990 & JP A 02 055 116 (Nissei Plastics Ind Co) 23 Feb. 1990. *
Patent Abstracts of Japan, vol. 14, No. 224 (M-972) (4167) 11 May 1990 & JP-A-02 055 116 (Nissei Plastics Ind Co) 23 Feb. 1990.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070026096A1 (en) * 2005-07-29 2007-02-01 Fanuc Ltd Injection molding machine
US7431583B2 (en) * 2005-07-29 2008-10-07 Fanuc Ltd Injection molding machine
US11607831B2 (en) * 2018-08-29 2023-03-21 Nissei Plastic Industrial Co., Ltd. Injection device
US11267177B2 (en) * 2018-11-21 2022-03-08 The Japan Steel Works. Ltd. Injection device
US11318651B2 (en) * 2018-12-27 2022-05-03 Fanuc Corporation Heated cylinder for resin melting in molding machine

Also Published As

Publication number Publication date
EP0586706A1 (de) 1994-03-16
EP0586706A4 (de) 1995-02-15
KR970008207B1 (ko) 1997-05-22
JPH05269811A (ja) 1993-10-19
JP2627846B2 (ja) 1997-07-09
WO1993018905A1 (en) 1993-09-30

Similar Documents

Publication Publication Date Title
US4010903A (en) Nozzle for injection molding of thermoplastics
US20100310708A1 (en) Nozzle for an Injection Molding Apparatus
US6852264B2 (en) Thermally insulated runner manifold and injection nozzle construction for plastic molding apparatus
US5460507A (en) Injection unit for use in an injection molding machine
US5505613A (en) Injection molding nozzle having a centering bushing
EP0672512B1 (de) Spritzgiessvorrichtung vom Vorplastifiziertyp
CA2099334C (en) Injection molding insert with melt inlet and pin aligned
US5591385A (en) Method for cooling injection molding molds
US4427361A (en) Shut-off nozzle for injection moulding of thermoplastics
EP0950494B1 (de) Zylindrischer Spritzgiess-Verteilereinsatz und Verfahren
US20040137107A1 (en) Hot runner nozzle with a tip, a tip surrounding piece and an alignment piece
JPS61272125A (ja) シリンダ温度調節装置を備えたスクリユ−型押出機
US4260348A (en) Sprue bushing for injection molding machine
JP2579861B2 (ja) 合成樹脂射出成形機の可塑化シリンダ
CA1228464A (en) Injection moulding and casting method and apparatus
EP0960713B1 (de) Spritzgiessvorrichtung mit Düsen, die langgestreckte Befestigungsflanschen aufweisen
US7217120B2 (en) Hot runner nozzle
JPH025932Y2 (de)
JPH054207B2 (de)
JP3025867B2 (ja) スクリュ式射出成形機の熱硬化性樹脂加熱装置
JP2566196B2 (ja) ランナ・チップ装置
JPS59140041A (ja) 射出成形機の射出ノズル
JP2678982B2 (ja) 射出成形機
JPH06285915A (ja) 射出成形金型装置
JPS625767Y2 (de)

Legal Events

Date Code Title Description
AS Assignment

Owner name: FANUC LT, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAKATSUGI, SATOSHI;REEL/FRAME:006921/0641

Effective date: 19931108

STCF Information on status: patent grant

Free format text: PATENTED CASE

CC Certificate of correction
FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12